#include <iostream>
using namespace std;


void test(int &ref1,int &ref2){
    cout <<&ref1<<":"<<&ref2<<endl;
}
int main(int argc, char * argv[]){
    int num1=10;
    int num2=20;
    cout<<&num1<<":"<<&num2<<endl;
    test(num1,num2);
    return 0;
}

